|Drop(s)|Multiplayer Map(s)|Spec Ops Mission(s)|Face Off Map(s)|Xbox 360 release date|PlayStation 3 release date|
|---|---|---|---|---|---|
|1-2|Liberation & Piazza|None|None|24 January 2012|28 February 2012|
|3|Overwatch|None|None|21 February 2012|29 March 2012|
|4-6|Black Box|Black Ice & Negotiator|None|13 March 2012|12 April 2012|
|7-8|Sanctuary & Foundation|None|None|10 April 2012|10 May 2012|
|9-12|Oasis|Iron Clad & Kill Switch|Getaway & Lookout|15 May 2012|14 June 2012|
|13-15|None|Arctic Recon|Vortex, U-Turn & Intersection|19 June 2012|19 July 2012|
|16-18|Decommission & Offshore|Vertigo|None|17 July 2012|16 August 2012|
|19-21|None|Special Delivery, Light 'Em Up & Special Ops Chaos Mode|None|7 August 2012|6 September 2012|
|22-24|Parish, Gulch & Boardwalk|None|None|5 September 2012|9 October 2012|

Question: what is the total number of multiplayer maps released during this time?
Answer: 12